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<a name="1" href="#1">1</a>   <strong class="jxr_keyword">package</strong> com.googlecode.transloader.clone.reflect;
<a name="2" href="#2">2</a>   
<a name="3" href="#3">3</a>   <strong class="jxr_keyword">import</strong> java.util.Map;
<a name="4" href="#4">4</a>   
<a name="5" href="#5">5</a>   <strong class="jxr_keyword">import</strong> com.googlecode.transloader.Assert;
<a name="6" href="#6">6</a>   <strong class="jxr_keyword">import</strong> com.googlecode.transloader.clone.CloningStrategy;
<a name="7" href="#7">7</a>   <strong class="jxr_keyword">import</strong> com.googlecode.transloader.clone.reflect.CyclicReferenceSafeTraverser.Traversal;
<a name="8" href="#8">8</a>   
<a name="9" href="#9">9</a>   <em class="jxr_javadoccomment">/**</em>
<a name="10" href="#10">10</a>  <em class="jxr_javadoccomment"> * A &lt;code&gt;CloningStrategy&lt;/code&gt; that uses Java Reflection as its mechanism. Can clone whole object graphs or just</em>
<a name="11" href="#11">11</a>  <em class="jxr_javadoccomment"> * necessary parts depending on how it is configured.</em>
<a name="12" href="#12">12</a>  <em class="jxr_javadoccomment"> * </em>
<a name="13" href="#13">13</a>  <em class="jxr_javadoccomment"> * @author Jeremy Wales</em>
<a name="14" href="#14">14</a>  <em class="jxr_javadoccomment"> */</em>
<a name="15" href="#15">15</a>  <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">final</strong> <strong class="jxr_keyword">class</strong> <a href="../../../../../com/googlecode/transloader/clone/reflect/ReflectionCloningStrategy.html">ReflectionCloningStrategy</a> implements <a href="../../../../../com/googlecode/transloader/clone/CloningStrategy.html">CloningStrategy</a> {
<a name="16" href="#16">16</a>  	<strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">final</strong> <a href="../../../../../com/googlecode/transloader/clone/reflect/CyclicReferenceSafeTraverser.html">CyclicReferenceSafeTraverser</a> cyclicReferenceSafeTraverser = <strong class="jxr_keyword">new</strong> <a href="../../../../../com/googlecode/transloader/clone/reflect/CyclicReferenceSafeTraverser.html">CyclicReferenceSafeTraverser</a>();
<a name="17" href="#17">17</a>  
<a name="18" href="#18">18</a>  	<strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">final</strong> <a href="../../../../../com/googlecode/transloader/clone/reflect/CloningDecisionStrategy.html">CloningDecisionStrategy</a> decider;
<a name="19" href="#19">19</a>  	<strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">final</strong> <a href="../../../../../com/googlecode/transloader/clone/reflect/InnerCloner.html">InnerCloner</a> arrayCloner;
<a name="20" href="#20">20</a>  	<strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">final</strong> <a href="../../../../../com/googlecode/transloader/clone/reflect/InnerCloner.html">InnerCloner</a> normalObjectCloner;
<a name="21" href="#21">21</a>  	<strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">final</strong> <a href="../../../../../com/googlecode/transloader/clone/CloningStrategy.html">CloningStrategy</a> fallbackCloner;
<a name="22" href="#22">22</a>  
<a name="23" href="#23">23</a>  	<em class="jxr_javadoccomment">/**</em>
<a name="24" href="#24">24</a>  <em class="jxr_javadoccomment">	 * Contructs a new &lt;code&gt;ReflectionCloningStrategy&lt;/code&gt; with its dependencies injected.</em>
<a name="25" href="#25">25</a>  <em class="jxr_javadoccomment">	 * </em>
<a name="26" href="#26">26</a>  <em class="jxr_javadoccomment">	 * @param cloningDecisionStrategy the strategy by which the decision to clone or not to clone a particular given</em>
<a name="27" href="#27">27</a>  <em class="jxr_javadoccomment">	 *            object is made</em>
<a name="28" href="#28">28</a>  <em class="jxr_javadoccomment">	 * @param instantiator the strategy by which to use instantiate normal objects (as opposed to arrays, for which</em>
<a name="29" href="#29">29</a>  <em class="jxr_javadoccomment">	 *            standard reflection is always adequate)</em>
<a name="30" href="#30">30</a>  <em class="jxr_javadoccomment">	 * @param fallbackCloningStrategy the &lt;code&gt;CloningStrategy&lt;/code&gt; to fall back to when &lt;code&gt;this&lt;/code&gt;</em>
<a name="31" href="#31">31</a>  <em class="jxr_javadoccomment">	 *            strategy fails</em>
<a name="32" href="#32">32</a>  <em class="jxr_javadoccomment">	 */</em>
<a name="33" href="#33">33</a>  	<strong class="jxr_keyword">public</strong> <a href="../../../../../com/googlecode/transloader/clone/reflect/ReflectionCloningStrategy.html">ReflectionCloningStrategy</a>(<a href="../../../../../com/googlecode/transloader/clone/reflect/CloningDecisionStrategy.html">CloningDecisionStrategy</a> cloningDecisionStrategy,
<a name="34" href="#34">34</a>  			InstantiationStrategy instantiator, <a href="../../../../../com/googlecode/transloader/clone/CloningStrategy.html">CloningStrategy</a> fallbackCloningStrategy) {
<a name="35" href="#35">35</a>  		Assert.areNotNull(cloningDecisionStrategy, instantiator, fallbackCloningStrategy);
<a name="36" href="#36">36</a>  		decider = cloningDecisionStrategy;
<a name="37" href="#37">37</a>  		arrayCloner = <strong class="jxr_keyword">new</strong> <a href="../../../../../com/googlecode/transloader/clone/reflect/InnerArrayCloner.html">InnerArrayCloner</a>(<strong class="jxr_keyword">this</strong>);
<a name="38" href="#38">38</a>  		normalObjectCloner = <strong class="jxr_keyword">new</strong> <a href="../../../../../com/googlecode/transloader/clone/reflect/InnerNormalObjectCloner.html">InnerNormalObjectCloner</a>(<strong class="jxr_keyword">this</strong>, instantiator);
<a name="39" href="#39">39</a>  		fallbackCloner = fallbackCloningStrategy;
<a name="40" href="#40">40</a>  	}
<a name="41" href="#41">41</a>  
<a name="42" href="#42">42</a>  	<em class="jxr_javadoccomment">/**</em>
<a name="43" href="#43">43</a>  <em class="jxr_javadoccomment">	 * {@inheritDoc}</em>
<a name="44" href="#44">44</a>  <em class="jxr_javadoccomment">	 * &lt;p&gt;</em>
<a name="45" href="#45">45</a>  <em class="jxr_javadoccomment">	 * This implementation uses {@link CyclicReferenceSafeTraverser} to sucessfully handle cyclic references in the</em>
<a name="46" href="#46">46</a>  <em class="jxr_javadoccomment">	 * given object graph.</em>
<a name="47" href="#47">47</a>  <em class="jxr_javadoccomment">	 * &lt;/p&gt;</em>
<a name="48" href="#48">48</a>  <em class="jxr_javadoccomment">	 * </em>
<a name="49" href="#49">49</a>  <em class="jxr_javadoccomment">	 * @return a completely or partially cloned object graph, depending on the &lt;code&gt;CloningDecisionStrategy&lt;/code&gt;</em>
<a name="50" href="#50">50</a>  <em class="jxr_javadoccomment">	 *         injected in</em>
<a name="51" href="#51">51</a>  <em class="jxr_javadoccomment">	 *         {@link #ReflectionCloningStrategy(CloningDecisionStrategy, InstantiationStrategy, CloningStrategy)},</em>
<a name="52" href="#52">52</a>  <em class="jxr_javadoccomment">	 *         with potentially the &lt;code&gt;original&lt;/code&gt; itself being the top-level object in the graph returned if</em>
<a name="53" href="#53">53</a>  <em class="jxr_javadoccomment">	 *         it was not cloned</em>
<a name="54" href="#54">54</a>  <em class="jxr_javadoccomment">	 */</em>
<a name="55" href="#55">55</a>  	<strong class="jxr_keyword">public</strong> Object cloneObjectUsingClassLoader(<strong class="jxr_keyword">final</strong> Object original, <strong class="jxr_keyword">final</strong> ClassLoader targetClassLoader)
<a name="56" href="#56">56</a>  			<strong class="jxr_keyword">throws</strong> Exception {
<a name="57" href="#57">57</a>  		Assert.areNotNull(original, targetClassLoader);
<a name="58" href="#58">58</a>  		Traversal cloningTraversal = <strong class="jxr_keyword">new</strong> <a href="../../../../../com/googlecode/transloader/clone/reflect/CyclicReferenceSafeTraverser.html">Traversal</a>() {
<a name="59" href="#59">59</a>  			<strong class="jxr_keyword">public</strong> Object traverse(Object currentObject, Map referenceHistory) <strong class="jxr_keyword">throws</strong> Exception {
<a name="60" href="#60">60</a>  				<strong class="jxr_keyword">return</strong> ReflectionCloningStrategy.<strong class="jxr_keyword">this</strong>.clone(currentObject, targetClassLoader, referenceHistory);
<a name="61" href="#61">61</a>  			}
<a name="62" href="#62">62</a>  		};
<a name="63" href="#63">63</a>  		<strong class="jxr_keyword">return</strong> cyclicReferenceSafeTraverser.performWithoutFollowingCircles(cloningTraversal, original);
<a name="64" href="#64">64</a>  	}
<a name="65" href="#65">65</a>  
<a name="66" href="#66">66</a>  	<strong class="jxr_keyword">private</strong> Object clone(Object original, ClassLoader targetClassLoader, Map cloneHistory) <strong class="jxr_keyword">throws</strong> Exception {
<a name="67" href="#67">67</a>  		<strong class="jxr_keyword">if</strong> (original == <strong class="jxr_keyword">null</strong>) <strong class="jxr_keyword">return</strong> <strong class="jxr_keyword">null</strong>;
<a name="68" href="#68">68</a>  		<strong class="jxr_keyword">try</strong> {
<a name="69" href="#69">69</a>  			<strong class="jxr_keyword">return</strong> performIntendedCloning(original, targetClassLoader, cloneHistory);
<a name="70" href="#70">70</a>  		} <strong class="jxr_keyword">catch</strong> (Exception e) {
<a name="71" href="#71">71</a>  			<strong class="jxr_keyword">return</strong> performFallbackCloning(original, targetClassLoader);
<a name="72" href="#72">72</a>  		}
<a name="73" href="#73">73</a>  	}
<a name="74" href="#74">74</a>  
<a name="75" href="#75">75</a>  	<strong class="jxr_keyword">private</strong> Object performIntendedCloning(Object original, ClassLoader targetClassLoader, Map cloneHistory)
<a name="76" href="#76">76</a>  			<strong class="jxr_keyword">throws</strong> Exception {
<a name="77" href="#77">77</a>  		InnerCloner innerCloner = original.getClass().isArray() ? arrayCloner : normalObjectCloner;
<a name="78" href="#78">78</a>  		Object clone = original;
<a name="79" href="#79">79</a>  		<strong class="jxr_keyword">if</strong> (decider.shouldCloneObjectItself(original, targetClassLoader))
<a name="80" href="#80">80</a>  			clone = innerCloner.instantiateClone(original, targetClassLoader);
<a name="81" href="#81">81</a>  		cloneHistory.put(original, clone);
<a name="82" href="#82">82</a>  		<strong class="jxr_keyword">if</strong> (decider.shouldCloneObjectContent(original, targetClassLoader))
<a name="83" href="#83">83</a>  			innerCloner.cloneContent(original, clone, targetClassLoader);
<a name="84" href="#84">84</a>  		<strong class="jxr_keyword">return</strong> clone;
<a name="85" href="#85">85</a>  	}
<a name="86" href="#86">86</a>  
<a name="87" href="#87">87</a>  	<strong class="jxr_keyword">private</strong> Object performFallbackCloning(Object original, ClassLoader targetClassLoader) <strong class="jxr_keyword">throws</strong> Exception {
<a name="88" href="#88">88</a>  		<strong class="jxr_keyword">return</strong> fallbackCloner.cloneObjectUsingClassLoader(original, targetClassLoader);
<a name="89" href="#89">89</a>  	}
<a name="90" href="#90">90</a>  }
</pre>
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